Abstract
Objectives This study aimed at finding out whether anterior teeth angulation and inclination have a relationship with the maxillary teeth and dental arch dimensions. Methods Fifty study models with normal occlusion were selected from the archive of the Department of Orthodontics at Baghdad Dental Faculty. Maxillary dental arch width and length at different points were determined in addition to measuring anterior teeth angulation, inclination, crown thickness, overjet, overbite, and Bolton's ratios. The unpaired t-test and Pearson's correlation coefficient test were used for data analysis. Results No statistical gender differences were reported in all measurements except the dental arch widths and length where males had significantly higher mean values. Only the maxillary incisor's inclination showed a direct weak significant correlation with the total arch length. Conclusions The inclination of upper incisors had a minimal effect on increasing dental arch length.
Highlights
One of the primary diagnostic aids utilized by orthodontists in establishing diagnosis and treatment planning is the study model [1]
Correcting a malocclusion requires achieving an optimum occlusion with good interdigitation, compatible maxillary, and mandibular teeth sizes and ideal overjet and overbite within the envelope of the basal bone [2]
Altering the axial inclination in mesiodistal and labiolingual direction is considered a promising method to manage the discrepancy between the tooth material and basal bone [3]
Summary
One of the primary diagnostic aids utilized by orthodontists in establishing diagnosis and treatment planning is the study model [1]. Correcting a malocclusion requires achieving an optimum occlusion with good interdigitation, compatible maxillary, and mandibular teeth sizes and ideal overjet and overbite within the envelope of the basal bone [2]. Altering the axial inclination in mesiodistal and labiolingual direction is considered a promising method to manage the discrepancy between the tooth material and basal bone [3]. In 1972, Andrews developed the six keys for normal occlusion and clarified in the second and third keys the role of angulation and inclination in establishing optimum occlusion in addition to their effect on the dental arch length and perimeter after examining many dental models of normal occlusion individuals and subjects treated orthodontically [4]. Roth [5] and others [6,7,8,9,10] modified the normal values recorded by Andrews, so that many prescriptions are available nowadays
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